Air diffuser



FIG. 1 is a top plan view illustration of the new design for an air diffuser.

FIG. 2 is a left side view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top, front, left side perspective view thereof. 

CLAIM The ornamental design for air diffuser, as shown and described. 